Scale.



F.. H. BUCKINGHAMS SCALE.

APPLICATION FILED FEB. 1B, 1909.

Pateues @y 19%.

E SHEETS-SHEET l.

F. H. BUGKINGHAYL SCALE.

APPLICATION FILED FEB. 18, 1909.

- Patented NW9, 19509.

8 SHEETS-SHEET 2.

F. H. BUCKINGHAM.

SCALE.

APPLICATION FILED 1113.18, 1909.

939,2 1 3. Patented Nov. 9, 1909.

S SHBBTS-SHEET 3.

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"UNITED sTArEs PATENT on ICE.

FREMONT H. BUCKINGHAM, OF DETROIT, MICHIGAN, ASSIGNOR TO STANDARD COM-PUTING SCALE COMPANY, LIMITED, OF DETROIT, MICHIGAN, A LIMITED PARTNER-SHIP.

SCALE.

Specication of Letters Patent.

Patented Nov. 9, 1909.

To all whom it may concern:

Be it known that I, FREMONT H. BUCK- INGHAM, a citizen of the UnitedStates, and a resident of Detroit, in the county of Wayne and State ofMichigan, have invented a new and Improved Scale, of which the followingis a speciiication. l h This invention relates to automatic weighingscales in which the angular 4position of a pendulum is varied by thedownward pressure of the article being weighed, which change of positionis indicated by a movable indicator, and the objects of this inventionare to provide a scale of this kind wherein the indicator shall alwaysmove through e ual arcs for e ual increases and decreases o the weight othe articles on the scale, and wherein all parts which move relative toeach other accomplish their movements from relatively fixed lines orpoints.

In the accompanying drawings, Figure 1 is a View of the scale and itslevers, part of the base bein brokenpaway. Fig. 2 is a plan of thet(levers. Fig. 3 is an elevation, on a larger scale, of the levers andpendulum. Figs. 4 and 5 are diagrams of the levers. Fig. 6 is a viewsimilar to Fig. 3, showing the levers in a di'erent position. Fig. 7 isacross section on the line 7-7 of Fi s. 3 and 6.

imilar reference characters refer to like parts throughout the severalviews.

In the usual-so-called pendulum automatic scales, an indicator attachedto the pendulum passes over a scale, chart or dial graduated to indicatewelghts, and the s aces between these graduations vary with tEeirdistance from the zero point. The indicator moves equal angulardistancesvwith the endulum, but the leverage of the weight of hependulum and the parts connected thereto 1s the cosine of the angle itmakes with the horizontal.

In 'the construction shown in the accompanying drawings, the arcs ofmovement of the endulum and the indicator are in proort1on to theweights placed on the platorm.

The mechanism of the construction shown rests on a sub-base l havinglugs 2 and knife edges 3. A base 4 rests on these knife-edges, and isheld down by the adjusting screws 5 that enter threaded holes in thelugs 2. By these means the top of the base can be held level at alltimes.

Mounted on the base 4 are the pedestals 7 and 8 and the anchor post 9,which together support the movable mechanism of the scale. The mainlever has a front portion 1() and a rearwardly projecting bifurcated arm11, on which parts are mounted the knife-edge pivots 12, 13, 14 and 15.The pivots 12 rest on the pedestals 7, the pivots 13 support the lugs 16of the platform 17 the pivots 14 support the second lever, an the pivots15 connect to the indicating mechanism., v

The second lever has a forwardly extending portion 19 which is made openfor lightness, and a rearwardly extending arm 20. Pivots 21 at the frontof the portion 19 support lugs 22 of the platform; the pivots 23 rest onthe connecting thrust-links 24 which in turn rest on the pivots 14 ofthe main lever; and the pivot 25 at the rear end of the arm 20 engagesthe under side of the upper bearing block carried by the link 26, thelower bearing block on this link being engaged by the anchor post 9. Alink 27 is connected to the main lever on a line with the pivots 13 andwith the seconddever on a line with the pivots 21, that is, this linkconnects to the two levers on the lines of the pivots that support theplatform.

The proportions of the distances between pivots 12 and 14, betweenpivots 21 and 23, and the length of the link 24, to the distancesbetween pivots 12 and 13, between pivots 21 and 25, and the length ofthe link 26 respectively, should always be constant as shown in Fig. 1.But this rule alone holds good for but llmited arcs. For large arcs ofmovement of the main lever, as when a drum indicator is employed, thedistance between the pivots 12 and 14, between the pivots 13 and 14, andbetween the pivots 14 and 23 should be equal, and one half of the lengthof the link 26. The distance between the pivots 21 and 23 and betweenpivots 23 and25 should be equal. Under such conditions, shown in Fi s. 3and 6, the movements of all the parts wi l be without binding. The link27 preserves a perfect relation between the two levers.

Because of the length of the arm 11 and its wei t, the pressure on itsrear end will .norma y be down, and the effect of the wei ht on theplatform will be to brinO' lthe. pen ulum toits lowest point which willoccur when the pointer indica es a weight of the full capacity of thechart or dial. This is the exact opposite of the usual pendulum scalewhere the pendulum is at its lowest point when the scale is unloaded.

Projecting upward from the base et is a plate or frame 30, shown inFig.' l, which supports the chart or dial 3l, and to which is secured abrace 32 at the points 33 and 3a. This brace is spaced a distance fromthe frame so the indicator 35 may freely pass behind it. See Fig. 6. Theindicator is connected to a pendulum rod 36 which carries a weight 37,both pendulum and indicator being carried by the pivots 38 which rest onthe pedestal 8. An arm 39 on the pendulum carries a pivot 40. A.thrust-link or pin 4i rests on this pivot 40 and the pointed upper endof this link engages the bearing block 4:2 carried by the yoke 43. Thelower ends of this yoke engage the pivots 15 on the main lever, whileits upper end is connected to the adjuster 4A by means of the link 45. d

'llhe adjuster is lt, shaped, its upper end is adj ustably pivoted at4:7 to the upturned end 48 of the brace 32, while a screw 49 carried by'this brace passes 'through an aperture 50 in the angle of the adjuster.The adjuster may be swung to the right or left, or it may be raised andlowered to vary the path of the upper end of the linkY elf rlhesemovements all vary the rate of movement of the indicator for constantincreases in weights on the platform.

Projecting from the rear end of the lmain lever is an arm 55, to whichis connected the piston rod 56 of the piston 57. rllie cyliner 58contains a liquid which does not easily evaporate and which ispreferably somewhat viscid. The piston 57 is but slightly less indiameter than the bore of the cylinder. As a result, the rear end of thelever will move up and down slowly without excessive vibration and willsoon come to rest. A dash pot connected at this point saves theknife-edoe pivots from unnecessary wear. llt will e noticed that thepiston 57 is shown hollow. In practice it is desirable that the weightof the piston when submerged is just a little more than that of thefluid it displaces, the result being to practically eliminate frictionat this point.

The operation of the parts is as follows. When the parts are in theposition shown in Figs. 1, 3 and 4, with the indicator at zero, theexcess in weight of the rear end of the main lever will not onlcounter-balance the platform but also the pendulum. Any Weight placed onthe platform will remove some of the pressure from the pendulumpermitting it to swing to the left, until the indicator has reached themaximum of its travel to the right, when the scale will be balanced.This position is shown in Fig. 6, it being understood that the resultantof the weights esame of both pendulum and indicator is practically underthe pivot 38 in the drawing.

Any desirable dial or hart 3l may be secured to the plate 30. `lfdesired, a tare beam G0 may `be secured to' the main lever at the points6l and 62, the poise 63 being counter-balanced in any desirable mannerwhen at the right in F ig. 2. Many changes lmay be made in the detailsof construction of this mechanism without departing from the spirit ofmy invention.

Having now explained my improvements, what l claim as my invention anddesire to secure by Letters Patent is l. In a scale, the combination ofa base, a main scale beam provided with pivots at each end and pivotallymounted on the base intermediate its ends, a second lever having pivotsat each end and intermediate its ends, connecting blocks mounted onpivots on the frontarm of the main lever upon which blocks the secondlever is mounted, a platform resting on pivots carried by the front armsof both levers, a swinging link engaging the rear arm of the secondlever to hold it from rising, a link connectingthe front arm of bothlevers to prevent endwise movement between them, a pendulum connected tothe rear end of the main lever, and an indicator secured to saidpendulum.

2. In a scale, the combination of a base, a vertical plate mounted onthe base, a scale leved pivotally mounted on said base intermediate itsends, a pendulum pivotally mounted on (said base, a yoke pivotallycennected to theJ rear end of the lever, a pin pivotally engaging theyoke and the pendulum, an adjuster mounted on said plate, and aconnector between the adjuster and one end of said yoke.

3. In a scale, the combination of a base, a scale lever mounted thereonintermediate its ends, a weight receiving device mounted on one end ofsaid lever, a pendulum mounted on said base near the opposite end of thelever and provided with an arm having a pivot mounted thereon, a pinmounted on said pivot, a yoke resting on said pin and having downwardlyextending arms engaging pivots at the end of said lever, and means tocontrol the movement of said yoke and pin. y

` 4L. ln a scale, the combination of a base, a scale lever fulcrumed onsaid base and having arms extending forward and rearward, a weightreceiving device mounted on the forward arm, a pendulum pivoted adjacentthe rear end of the lever and having a laterally extending arm, acompression member and a 'tension member connecting the arm on thependulum to the rear arm of the scale lever to coordinate the movementsof the same, and a pointer to indicate the movements.

5. In a scale, the combination of a base, a

a picot at the rear end of the second lever,

a platform supported by pivots mounted on the front ends of both levers,and connecting blocks resting on pivots 'mounted on the front end of themain lever, said second lever having pivots intermediate its endsresting on the connecting blocks.

6. In an automatic scale, the combination I of a scale lever, apendulum, an indicator connected to the pendulum, a connecting linkbetween the lever and pendulum, and a controller for the path of thelink.

7. In an automatic scale, the combination of a scale lever, a pendulum,an indicator connected to said pendulum, a link connected to said lever,a pin engaging the link and the pendulum, and means to control the pathof the point of engagement between the link and pin.

8. In an automatic scale, the combination of a scale lever, an upwardlyextending link pivoted thereto, means to control the path of the upperend of the link, a pendulum, and a thrust member between the link andpendulum.

9. In an automatic scale, the combination of a frame,ra. scale leverpivotally mounted thereon, an upwardly extending link pivoted thereto, acontrolling device for the path of the upper end of the link comprisingan adjustable pivot and a connecting link, a pendulum, and a connectorbetween the upwardly 'extending link and the pendulum.

10. In an automatic scale, the combination of a scale-lever, a pendulum,a jointed connector between the lever and pendulum, and a pivoted linkto control the path of the joint in said connector.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

FREMONT H. BUCKINGHAM. Witnesses:

OSCAR B. MARX,

LOUIS J AENIGHEN.

